I have 5 acres and an excavator and decided it would fun to try a low-tech geothermal heating and cooling system by burying 600 feet of plastic water pipe down 8 feet and connecting to radiator/pump/fan in my shed that has my lifepo/inverters. I'm in a cold region and I figure I can stabilize the temperature in winter above freezing in my insulated shed and also cool for around 100watts for the pump and fan. Has anyone else ever done this?